package filesys import ( "context" "fmt" "io" "math" "net/http" "os" "sync" "time" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" ) type FileHandle struct { // cache file has been written to dirtyPages *ContinuousDirtyPages contentType string handle uint64 sync.RWMutex f *File RequestId fuse.RequestID // unique ID for request NodeId fuse.NodeID // file or directory the request is about Uid uint32 // user ID of process making request Gid uint32 // group ID of process making request } func newFileHandle(file *File, uid, gid uint32) *FileHandle { fh := &FileHandle{ f: file, dirtyPages: newDirtyPages(file), Uid: uid, Gid: gid, } if fh.f.entry != nil { fh.f.entry.Attributes.FileSize = filer.FileSize(fh.f.entry) } return fh } var _ = fs.Handle(&FileHandle{}) // var _ = fs.HandleReadAller(&FileHandle{}) var _ = fs.HandleReader(&FileHandle{}) var _ = fs.HandleFlusher(&FileHandle{}) var _ = fs.HandleWriter(&FileHandle{}) var _ = fs.HandleReleaser(&FileHandle{}) func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error { glog.V(4).Infof("%s read fh %d: [%d,%d) size %d resp.Data cap=%d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, cap(resp.Data)) fh.RLock() defer fh.RUnlock() if req.Size <= 0 { return nil } buff := resp.Data[:cap(resp.Data)] if req.Size > cap(resp.Data) { // should not happen buff = make([]byte, req.Size) } totalRead, err := fh.readFromChunks(buff, req.Offset) if err == nil { maxStop := fh.readFromDirtyPages(buff, req.Offset) totalRead = max(maxStop-req.Offset, totalRead) } if err == io.EOF { err = nil } if err != nil { glog.Warningf("file handle read %s %d: %v", fh.f.fullpath(), totalRead, err) return fuse.EIO } if totalRead > int64(len(buff)) { glog.Warningf("%s FileHandle Read %d: [%d,%d) size %d totalRead %d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, totalRead) totalRead = min(int64(len(buff)), totalRead) } // resp.Data = buff[:totalRead] resp.Data = buff return err } func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) { maxStop = fh.dirtyPages.ReadDirtyDataAt(buff, startOffset) return } func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) { fileSize := int64(filer.FileSize(fh.f.entry)) if fileSize == 0 { glog.V(1).Infof("empty fh %v", fh.f.fullpath()) return 0, io.EOF } if offset+int64(len(buff)) <= int64(len(fh.f.entry.Content)) { totalRead := copy(buff, fh.f.entry.Content[offset:]) glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead) return int64(totalRead), nil } var chunkResolveErr error if fh.f.entryViewCache == nil { fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(filer.LookupFn(fh.f.wfs), fh.f.entry.Chunks) if chunkResolveErr != nil { return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr) } fh.f.reader = nil } if fh.f.reader == nil { chunkViews := filer.ViewFromVisibleIntervals(fh.f.entryViewCache, 0, math.MaxInt64) fh.f.reader = filer.NewChunkReaderAtFromClient(fh.f.wfs, chunkViews, fh.f.wfs.chunkCache, fileSize) } totalRead, err := fh.f.reader.ReadAt(buff, offset) if err != nil && err != io.EOF { glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err) } glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead, err) return int64(totalRead), err } // Write to the file handle func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error { fh.Lock() defer fh.Unlock() // write the request to volume servers data := req.Data if len(data) <= 512 { // fuse message cacheable size data = make([]byte, len(req.Data)) copy(data, req.Data) } fh.f.entry.Content = nil fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize))) glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data)) fh.dirtyPages.AddPage(req.Offset, data) resp.Size = len(data) if req.Offset == 0 { // detect mime type fh.contentType = http.DetectContentType(data) fh.f.dirtyMetadata = true } fh.f.dirtyMetadata = true return nil } func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error { glog.V(4).Infof("Release %v fh %d", fh.f.fullpath(), fh.handle) fh.Lock() defer fh.Unlock() fh.f.isOpen-- if fh.f.isOpen < 0 { glog.V(0).Infof("Release reset %s open count %d => %d", fh.f.Name, fh.f.isOpen, 0) fh.f.isOpen = 0 return nil } if fh.f.isOpen == 0 { if err := fh.doFlush(ctx, req.Header); err != nil { glog.Errorf("Release doFlush %s: %v", fh.f.Name, err) } // stop the goroutine if !fh.dirtyPages.chunkSaveErrChanClosed { fh.dirtyPages.chunkSaveErrChanClosed = true close(fh.dirtyPages.chunkSaveErrChan) } fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle)) if closer, ok := fh.f.reader.(io.Closer); ok { closer.Close() } fh.f.reader = nil } return nil } func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error { fh.Lock() defer fh.Unlock() return fh.doFlush(ctx, req.Header) } func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error { // flush works at fh level // send the data to the OS glog.V(4).Infof("doFlush %s fh %d", fh.f.fullpath(), fh.handle) fh.dirtyPages.saveExistingPagesToStorage() fh.dirtyPages.writeWaitGroup.Wait() if fh.dirtyPages.lastErr != nil { return fh.dirtyPages.lastErr } if !fh.f.dirtyMetadata { return nil } err := fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { if fh.f.entry.Attributes != nil { fh.f.entry.Attributes.Mime = fh.contentType if fh.f.entry.Attributes.Uid == 0 { fh.f.entry.Attributes.Uid = header.Uid } if fh.f.entry.Attributes.Gid == 0 { fh.f.entry.Attributes.Gid = header.Gid } if fh.f.entry.Attributes.Crtime == 0 { fh.f.entry.Attributes.Crtime = time.Now().Unix() } fh.f.entry.Attributes.Mtime = time.Now().Unix() fh.f.entry.Attributes.FileMode = uint32(os.FileMode(fh.f.entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask) fh.f.entry.Attributes.Collection = fh.dirtyPages.collection fh.f.entry.Attributes.Replication = fh.dirtyPages.replication } request := &filer_pb.CreateEntryRequest{ Directory: fh.f.dir.FullPath(), Entry: fh.f.entry, Signatures: []int32{fh.f.wfs.signature}, } glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks)) for i, chunk := range fh.f.entry.Chunks { glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size)) } manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(fh.f.entry.Chunks) chunks, _ := filer.CompactFileChunks(filer.LookupFn(fh.f.wfs), nonManifestChunks) chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.fullpath()), chunks) if manifestErr != nil { // not good, but should be ok glog.V(0).Infof("MaybeManifestize: %v", manifestErr) } fh.f.entry.Chunks = append(chunks, manifestChunks...) fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry) defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry) if err := filer_pb.CreateEntry(client, request); err != nil { glog.Errorf("fh flush create %s: %v", fh.f.fullpath(), err) return fmt.Errorf("fh flush create %s: %v", fh.f.fullpath(), err) } fh.f.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)) return nil }) if err == nil { fh.f.dirtyMetadata = false } if err != nil { glog.Errorf("%v fh %d flush: %v", fh.f.fullpath(), fh.handle, err) return fuse.EIO } return nil }